By analysis and research on working principle of mechanical parts and motorcycle disc brake, a test bench system based on programmable logic controller (PLC) for motorcycle brake was designed. The working principle and testing process of the system were described, and the hardware and software design of the system were elaborated. At the same time, sample parts were tested. The results show that the test system is accurate and highly efficient, which fully meets the test requirements for motorcycle brake manufacturers and achieves a qualification for motorcycle brake automated testing.